Mulching

I have some Leucanthemums in my garden. I will soon cut back and want to mulch the area. However, they have some healthy leaf growth at the base. Will mulching over the top of this be committing Leucanthemum homicide?

clk -I'm happy to be wrong but I mulch over hosta's and anything else which has disappeared under grown by now, apart from rubarb and mulch round this but then rubarb doesn't totally disappear the crown can still be seen above ground. So any thing with a crown showing gets a mulch round, anything not showing gets mulched over.

I mulch Oct/Nov so some stuff hasn't quite died back yet, ferns for instance so they get a mulch round.